Concrete-reinforcing bar.



P. H; KANE.

CONCRETE REINFORGING BAR.

APlLIOATIONIILED JAN.15, 1912.

Patented June 23, 1914.

" INVENTUR EJES if m L. 7 a 7 6 EU 9 1h 3 W, i a J 7 M a 7 a W ,M

- ATTORNEYS UNITED -STATES PATENT orricri; l

Toall whomit ma zfcon'cemr Be it known that I, Ps'rirox H. Karrie, a citizen of United Statm, residing at Bu'fl'a lo, in the county of Erie .aiid {State of New Ycrk, have invented new and useful improvements in Concrete-Reinforcing Bars, *o f which the following is a specific tion.

This invention relates to the bars employed 'for reinforcing concrete structures, such as columns and beams.

One object of my invention is the pi-o vision of a reinforcing bar ofthis character 1 which shall possess great strength in com-f pa'rison with its weight; which can be bent; or wound, without buckling, into @iral and l other forms required in producing columns, girders and other structural mem'bersand which can be-cheaplyp'roduced by rolling.

A further object is to so construct the bar that the concrete in which it is embedded is firmly interlocked therewith, in order to: form a strong and reliable bond between the parts of the structure. \v

In the accompanying drawings: Figure 1 is a fragmentary perspective view of a bar embodying the invention. Fig. 2 is atransverse section of a concrete column or beam reinforced by such bars. Fig. 3 is a section showing a modified form of the bar. Figs. 4, 5 and 6 are fragmentary side elevations of suitable rolls for producing the bars.

Similar numerals of reference indicate corresponding parts throughout the several views.

1 indicates a concrete structure, such for example as a column or a beam, which is reinforced by a number of the improved bars 2. As shown in Fig. 1, the bars extend lengthwise of the concrete structure and are suitably spaced or distributed and employed in such numbers as may be required by the size of the structure and the weight to be carried-b it.

Referring to the construction shown in Figs. 1 and 2, each'of these bars consists of a core or body 3 and four or more longitudinal Webs 4 extending outwardly from the body in different directions and provided with laterally-projecting anchoring heads, flanges or enlargements 5 which extend from both sides of each web. y

In its preferred form, the reinforcing bar is substantially cruci-form in cross section, as shown, and each of its webs is provided at its outer edge with a head or enlargement 6 p ific-am e'war'i'rma Patented June 23, 1914. lipifliodtiim men January 15,1912; 'aeaaim'enm.

of and extending continuously from end to end the web similar to the head or ball of a railway rail, This construction proa "Solid reinforcing bar which comb nes great strength with comparative lightproject-ing laterally bey'dnd sides 't hereas and at the same time presents-extensive andioring members or project-ions for the surrounding concrete. It will be observed that adjacent webs of the bar with their laterally-projecting heads or flanges form as undercut in-dovetailed space whichrecav s the concrete, firmly and-reliably interlocking it with the webs or vice versa. The concrete is thus held intact and prevented falling away from the reinforcing bars evenin the event of its becoming-cracked or loosened. While reinforcing theconcrete, 'the bars infturn remain fully ihcased by the concrete, a thoroughly fire pro'of'construction. As the heads of the several Webs are all integral therewith, the bar can be doubled without buckling to form beam or. glrder umts, or wound in spiral or other form around a group of similar longitudinal bars to form columns.

In order to further anchor the reinforcing bars in the concrete structure they may be provided with projecting ribs or corrugations 7 of any suitable form and with anchoring grooves: 8 alternating with said ribs; or d" esi may alone be employed. These ribs or grooves also effectually. resist longitudinal sl ppage or displacement of the bars in theconcrete.

The invention is not confined to bars-of cruciform cross section but is applicable to various other shapes and forms capable of being conveniently rolled.

The bar shown in Figs. 1 and 2 when rolled according to the ordinary method is formed. at the junction of its webs with angular longitudinal ribs 10, but if desired it maybe rolled without such ribs, as shown in Fi 3. The bar with its webs and heads is rol ed.s0lid from a single blank of metal. Suitable rolls for'this purpose are shown in Figs. 4, 5 and 6.

11 and 12 indicate a pair of roughing-rolls provided in their meeting faces with cooperating deep and shallow rooves 13 and 14 of'the proper shape to roll the blank 15' to a substantially cruciform cross section, as

shown in Fig. 4.

15 and 16 indicate a pair of finishing rolls red either the ribs or the grooves bars, in a manner w is passed through the finishing rolls 15 and 16, whereby two of its webs 4 are headed and corrugated, as shown in Fig. 5. The bar is then given a quarter-turn and again passed through said finishing rolls, thereby heading and corrugating the remaining two webs and completing the bar, as shown in Fig. 6. The solid ri-lled bar so produced, while aflording the advantages of lightness, great strength and a strong and reliable bond with the concrete structure, can be ro'ied zit-relatively small cost in a variety of sizes, ilmludin bars as small as a quarter of an lnch in dlameter.

them around a grou or cluster Ofla'rger known in this art.

Such small bars-v are useful as binders by bending or winding I claim as my invention:

1. A solid, rolled reinforcing bar for concrete structures, comprising a body-portion and four or more longitudinal webs extending therefrom in different directions and each rovided at its outer edge with a head exten ing beyon both sides of the web,

forming undercut concrete-receiving spaces between the adjacent webs, said bod -portion, webs and heads being all rolle integral from a sin le blank of metal.

2. A solid, ro lled reinforcing bar for concrete structures, comprising a body portion and four or more lon itudinal webs extendin therefrom in di erent directions, said we s being provided on their sides with anchoring means and each web having at its outer edge a head which extends beyond both sides thereof, forming undercut concrate-receiving spaces between the adjacent webs, said body portion, webs, heads and anchoring means being all rolled integral from a single blank of metal;

Witness my hand this 11th day of J anu- 3 PATRICK H. KANE.

Witnesses:

. E. M. GRAHAM, M. R. TAYLOR. 

